Malicious PDF — malware analysis report

Static analysis result for SHA-256 b670b2fd65185431…

MALICIOUS

PDF

78.3 KB Created: 2021-09-17 11:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c01bd747e563d125ea618ec6e5b642cc SHA-1: 11de669a3583bf9b093133070e5c650394c30d37 SHA-256: b670b2fd65185431215b2c4cc273ddc4477083ab446f18e9b9da9d6590c40b4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to numerous compromised websites and disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of multiple external URIs and a link farm heuristic indicates a strong likelihood of malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://podhoru.cz/userfiles/file/91406039939.pdf In PDF document text
    • http://termosystem.pl/userfiles/file/bewajoti.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/7770027052.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/82794660197.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140f0e119035---41316491344.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/40315458612.pdfIn PDF document text
    • http://agro-partner.com/Image/files/vumidijutunatob.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142e9304b0d9---37792162636.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/37565054291.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210917_604AA3C2391B9B4B.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/tizelisigez.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/tadurumefoxazoxelukefujil.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/2pk866f52qduiniiukcf4lr8i6/32779835605.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/setovarazepumom.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/juvufemoxatowuna.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/60093919355.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/26cc73fc8dcdc0f1ddc441f02c1baa62/18557485845.pdfIn PDF document text
    • http://mcutech.net/files/16109719695.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/0ca9b990e36404e3f4de46b78f9d98ec/wutesutemimolaj.pdfIn PDF document text
    • https://masukpt2.com/contents/files/75670832129.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/62193560258.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/42236433881.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/d76b5043e40695079e4d5504e7f316bf/54259618668.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/eb6eb41926869dd12db25c11cf90d9bf/nogifebikav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=morphvox+for+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE76 10312 bytes
SHA-256: 3b6bb556b26e335bf204df69178e8dd827e618cf9686617be5887957a466d3e6
font_01_sfnt_off0000e593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE593 17604 bytes
SHA-256: e66dff60be2705951b58eebd10921e354491cb87c31a3862583d3fd3e3ca90fb
font_02_sfnt_off0001136c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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